SOLVED: Pair a speed sensor to a Garmin 310XT

Garmin has a really neat ANT+ speed-sensing device, which fits to the hub and does away with the need for a spoke-mounted magnet. It can also be bought in conjunction with a magnet-less cadence sensor, and if you don't want the cadence sensor, that is where the pairing problem can arise.

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By the way, my motivation for doing this is to create a little bit more realism when turbo training. I have a crank-based power meter that also measures cadence, and fancy keeping a reasonable track of the distance I might have covered in the session. When you're turbo training, every motivation counts!